Disposable phone walkie

How to start a home business in Sims 2 open for business? - home business

I have several places to start a home business in the Sims 2 is a click on a phone or computer and choose the option of the company. The problem is ... no business tab when I click one of these elements. It is an area of "real" tab, but nothing to do ....
Does anyone know why? and how to start your home business?
I have the expansion pack.